Systemd-resolved

Enable Systemd-resolved

• Use the local stub file used by systemd

# Symlink /etc/resolv.conf to the stub file
$ ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf

• Configure the local stub file using systemd-resolved

# Configure DNS servers
$ vim /etc/systemd/resolved.conf.d/dns_servers.conf
 
[Resolve]
DNSSEC=no
Cache=yes
DNS=8.8.4.4 8.8.8.8
Domains=company.net
DNSStubListener=yes

• Restart systemd-resolved

$ systemctl restart systemd-resolved

• Check if the nameservers are used

$ systemd-resolved --status
 
Global
         DNS Servers: 8.8.4.4
                      8.8.8.8

Disable Systemd-resolved

• Use resolv.conf, not managed by systemd-resolved

# Remove symlink to the stub file
$ rm -rf /run/systemd/resolve/stub-resolv.conf

References: https://www.freedesktop.org/software/systemd/man/systemd-resolved.service.html https://wiki.archlinux.org/index.php/Systemd-resolved#Configuration

Resolvectl

• List domain settings

 ❯ resolvectl domain                          
Global:
Link 2 (wwan0):
Link 3 (enp0s31f6):
Link 4 (wlp0s20f3): company.net

• Set search domain for specific interface

❯ sudo resolvectl domain wlp0s20f3 company.net